Home / 122.88-280.13

Finding the Third Proportional to 122.88 and 280.13

Calculator

Solution

The third proportional to 122.88 and 280.13 is: 638.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.88 : 280.13 = 280.13 : x
  2. Step 2: Convert to fraction form
    122.88/280.13 = 280.13/x
  3. Step 3: Cross multiply
    122.88x = 280.13 × 280.13
  4. Step 4: Simplify right side
    122.88x = 78,470.02
  5. Step 5: Solve for x
    x = 78,470.02/122.88
  6. Step 6: Final answer
    x = 638.62

Related Problems

Find third proportional to 61.44 and 140.06
Half scale
Find third proportional to 245.75 and 560.25
Double scale
Find third proportional to 125 and 285
Similar ratio
Find third proportional to 184.31 and 420.19
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.